CN112666215A - Fused salt air heat exchange performance testing device - Google Patents
Fused salt air heat exchange performance testing device Download PDFInfo
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- CN112666215A CN112666215A CN202110034045.0A CN202110034045A CN112666215A CN 112666215 A CN112666215 A CN 112666215A CN 202110034045 A CN202110034045 A CN 202110034045A CN 112666215 A CN112666215 A CN 112666215A
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- molten salt
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- storage tank
- temperature
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- 150000003839 salts Chemical class 0.000 title claims abstract description 121
- 238000012360 testing method Methods 0.000 title claims abstract description 22
- 230000007246 mechanism Effects 0.000 claims abstract description 38
- 238000001816 cooling Methods 0.000 claims abstract description 25
- 238000007599 discharging Methods 0.000 claims abstract description 18
- 238000010438 heat treatment Methods 0.000 claims abstract description 16
- 238000001514 detection method Methods 0.000 claims abstract description 14
- 238000012546 transfer Methods 0.000 claims abstract description 8
- 239000007788 liquid Substances 0.000 claims description 3
- 238000011056 performance test Methods 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 9
- 230000008569 process Effects 0.000 abstract description 9
- 230000002441 reversible effect Effects 0.000 abstract description 4
- 238000002474 experimental method Methods 0.000 description 12
- 238000010586 diagram Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000005338 heat storage Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000011232 storage material Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000003889 chemical engineering Methods 0.000 description 1
- 238000010835 comparative analysis Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 150000002823 nitrates Chemical class 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention belongs to the technical field of fused salt heat exchange performance testing, and discloses a fused salt air heat exchange performance testing device which comprises a high-temperature fused salt circulation loop, a cooling mechanism arranged on the high-temperature fused salt circulation loop, and a detection mechanism arranged in the cooling mechanism; the high-temperature molten salt circulation loop comprises a molten salt storage tank, a feeding pipe and a discharging pipe, wherein the bottom end of the molten salt storage tank is provided with a heating rod, and the feeding pipe and the discharging pipe are used for communicating the molten salt storage tank with the cooling mechanism; the cooling mechanism comprises a heat exchanger fixedly arranged above the molten salt storage tank, air channels fixedly arranged on two sides of the working surface of the heat exchanger and an air pump communicated with the air channels; the heat exchanger forms a circulation loop with the molten salt storage tank through a feeding pipe and a discharging pipe; the detection mechanism is arranged in an air duct of the cooling mechanism. According to the invention, the thermal physical parameters such as the heat transfer coefficient of the molten salt and the like are deduced by collecting the actual working condition parameters such as air temperature, air flow and the like on two sides of the working surface of the heat exchanger, namely a reversible formula, so that the measuring process is simple, and the measuring result is accurate.
Description
Technical Field
The invention belongs to the technical field of fused salt heat exchange performance testing, and particularly relates to a fused salt air heat exchange performance testing device.
Background
At present, the molten salt has the characteristics of good thermal stability, low steam pressure, large heat capacity, strong dissolving capacity to substances, low viscosity and the like, is one of high-temperature heat storage materials which are mainstream internationally, and is widely applied to a plurality of fields such as metallurgy, chemical engineering, nuclear power, solar energy and the like. However, since the molten salt is formed by mixing a plurality of substances such as nitrates and the like, and parameters such as a heat transfer coefficient are not fixed, it is often necessary to first obtain thermophysical parameters such as a heat transfer coefficient of the molten salt before applying the molten salt.
However, compared with the conventional high-temperature heat storage material, the fused salt has high solidification temperature and certain corrosivity, and when the fused salt heat exchange performance experiment is carried out, the pipeline is easy to have blockage accidents, so that the fused salt heat exchange performance experiment is difficult to be carried out safely and stably to a certain extent. At present, a test bed for a heat exchange performance experiment is generally a small test bed with a low heat exchange coefficient such as air-water and the like, is limited by factors such as the type of a heat exchanger and the type selection of process materials, can only complete some heat exchange experiments with low temperature, and is difficult to test the heat exchange performance of high-temperature molten salt. And the measured experimental data often has certain errors due to the interference of factors such as the initial temperature, the flow velocity, the flow and the like of the heat exchange medium.
Disclosure of Invention
In order to solve the defects in the prior art, the invention aims to provide a fused salt air heat exchange performance testing device so as to achieve the purpose of deducing thermophysical parameters such as heat transfer coefficients of fused salts by acquiring actual working condition parameters such as air temperature, flow and pressure on two sides of a working surface of a heat exchanger, namely a reversible formula.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows: a molten salt air heat exchange performance testing device comprises a high-temperature molten salt circulation loop, a cooling mechanism arranged on the high-temperature molten salt circulation loop and a detection mechanism arranged inside the cooling mechanism;
the high-temperature molten salt circulation loop comprises a molten salt storage tank, a feeding pipe and a discharging pipe, wherein the bottom end of the molten salt storage tank is provided with a heating rod, and the feeding pipe and the discharging pipe are used for communicating the molten salt storage tank with the cooling mechanism; wherein the feeding pipe is communicated with the molten salt storage tank through a molten salt pump;
the cooling mechanism comprises a heat exchanger fixedly arranged above the molten salt storage tank, air channels fixedly arranged on two sides of the working surface of the heat exchanger and an air pump communicated with the air channels; the heat exchanger forms a circulation loop with the molten salt storage tank through a feeding pipe and a discharging pipe; the detection mechanism is arranged in an air duct of the cooling mechanism.
As the limitation of the invention, the detection mechanism comprises temperature sensors arranged at two sides of the working surface of the heat exchanger, a pressure sensor arranged at the middle position of the air duct and flow sensors arranged at the air inlet and the air outlet of the air duct; and the temperature sensor, the pressure sensor and the flow sensor are all in data connection with the computer.
As a further limitation of the present invention, each temperature sensor is fixedly arranged at one side of the working surface of the heat exchanger through a cross slide rail, and the cross slide rail is arranged in parallel with the working surface of the heat exchanger.
As a further limitation of the invention, the pressure sensor is fixedly arranged at the middle position of the air duct through the electric slide rail, and the pressure sensor is respectively arranged on four inner side walls of the air duct; the electric slide rail is arranged along the length direction of the air duct.
As a further limitation of the invention, the heat exchanger is a finned heat exchanger fixedly mounted above the molten salt storage tank through a heat exchanger support, and two ends of the working surface of the finned heat exchanger are uniformly provided with an air duct.
As a further limitation of the present invention, the bolt through holes for installing the fin heat exchanger on the heat exchanger bracket correspond to the bolt through holes for installing the air ducts on the fin heat exchanger one to one.
As another limitation of the invention, in the high-temperature molten salt circulation loop, the feeding pipe and the discharging pipe are both vertical pipes or inclined bent pipes.
As a further limitation of the invention, the molten salt storage tank is a square three-dimensional storage tank, and the bottom of the molten salt storage tank is provided with at least one heating rod in a penetrating manner.
As a further limitation of the invention, the upper end of the molten salt storage tank is provided with a standby port for measuring temperature and liquid level.
Due to the adoption of the technical scheme, compared with the prior art, the invention has the following beneficial effects:
(1) according to the invention, the fused salt is directly used as a heat medium, air is used as a cold medium to carry out a corresponding heat exchange experiment, the pressure and the flow of the air in the air duct and the air temperature on two sides of the working surface of the heat exchanger are detected, and the computer carries out comparative analysis on corresponding data to obtain the heat exchange working condition of the fused salt, so that thermophysical parameters such as the heat transfer coefficient of the fused salt can be derived by utilizing a formula in a reverse pushing manner, the determination process is simple, and the requirement on the precision of a determination device is low. Compared with an experiment table for testing the heat exchange performance of the molten salt in the prior art, the device is simpler in structure, lower in cost, less in interference factors and limiting conditions and more accurate in measured experimental data.
(2) The temperature sensor is fixedly arranged on one side of the working surface of the heat exchanger through the cross slide rail, the pressure sensor is fixedly arranged at the middle position of the air channel through the electric slide rail, the movable slide rail is arranged, the measurement position of each sensor can be conveniently adjusted, the temperature and the pressure of air in the experimental process can be more comprehensively measured by the sensors, and the accuracy of the detection result is further ensured.
(3) The heat exchanger adopts the finned heat exchanger, has compact structure, large heat exchange area, small air passing resistance and good and stable heat transfer performance, can quickly complete the heat exchange work of the molten salt, reduces the experimental process time, improves the experimental efficiency and reduces the experimental energy consumption.
(4) According to the invention, the bolt through holes on the heat exchanger bracket correspond to the bolt through holes on the fin type heat exchanger one by one, so that the installation of an air duct on the fin type heat exchanger can not be influenced while the safe and stable support of the fin type heat exchanger is ensured.
(5) According to the invention, the air flow is intelligently controlled through the air pump, so that the air flow has small change gradient, the change degree of the experimental environment is low, and the influence of the experimental environment on the measurement result can be further reduced.
(6) According to the invention, the feeding pipe and the discharging pipe are both vertical pipes or bent pipes with slopes, so that the molten salt can smoothly flow back to the molten salt storage tank after the experiment is finished, and the probability of pipeline blockage caused by the molten salt is reduced to a certain extent.
(7) According to the invention, the heating rods at the bottom end of the molten salt storage tank can be properly increased or decreased according to the actual storage amount of the molten salt in the molten salt storage tank, so that the heating power can be accurately adjusted according to the actual experimental needs, and the energy-saving effect is realized while the accurate temperature control is ensured.
In conclusion, the device has a compact and reasonable structure, is simple in the process of measuring the heat exchange performance of the molten salt, solves the problem of occupying space in a laboratory on the premise of ensuring the accuracy of the test data, and reduces the investment of expenses.
Drawings
The invention is described in further detail below with reference to the figures and the embodiments.
FIG. 1 is a schematic overall structure diagram of an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of the present invention without an air duct;
FIG. 3 is a schematic structural diagram of a molten salt storage tank according to an embodiment of the invention;
in the figure: 1. a molten salt storage tank; 2. a molten salt pump; 3. feeding pipes; 4. a discharging pipe; 5. a heating rod; 6. putting a clean mouth; 7. a return port; 8. a feed inlet; 9. a spare port; 10. a heat exchanger; 11. a heat exchanger support; 12. an air duct; 13. an air pump.
Detailed Description
Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the description of the preferred embodiment is only for purposes of illustration and understanding, and is not intended to limit the invention.
Embodiment molten salt air heat exchange performance testing device
The heat exchange working condition of fused salt and air is gathered in real time through detection mechanism to this embodiment utilizes the corresponding data of computer contrastive analysis, and then can be through the reverse thermophysical property parameters such as the coefficient of heat transfer of different ratio fused salts of deriving of formula.
As shown in fig. 1 to 3, the present embodiment includes a high-temperature molten salt circulation circuit, a cooling mechanism provided on the high-temperature molten salt circulation circuit, and a detection mechanism provided inside the cooling mechanism.
High-temperature molten salt circulation loop
The high-temperature molten salt circulating loop is used for containing and heating molten salt and conveying the high-temperature molten salt to the cooling mechanism. The high-temperature molten salt circulation loop comprises a molten salt storage tank 1, a molten salt pump 2, a feeding pipe 3 and a discharging pipe 4; specifically, as shown in fig. 3, the molten salt storage tank 1 is a square three-dimensional storage tank, the bottom end of the storage tank is provided with a clean discharge port 6, and the top end of the storage tank is provided with a reflux port 7, a feed port 8 and a standby port 9 for measuring temperature and liquid level. The bottom of fused salt storage tank 1 still runs through and is provided with at least one heating rod 5 that is used for heating the fused salt, and more specifically, be equipped with a plurality of through openings on the support of fused salt storage tank 1 bottom, all can insert a heating rod 5 in every through opening, during the experiment, can increase or reduce the quantity of heating rod 5 according to the actual reserves of fused salt in fused salt storage tank 1. In this embodiment, the bottom of the molten salt storage tank 1 is provided with two heating rods 5.
The feeding pipe 3 and the discharging pipe 4 are used for communicating the molten salt storage tank 1 and the cooling mechanism, so that the heat exchanger 10 in the cooling mechanism can form a circulation loop with the molten salt storage tank 1 through the feeding pipe 3 and the discharging pipe 4. As shown in fig. 1 and 2, the feeding pipe 3 is communicated with the molten salt storage tank 1 through the molten salt pump 2, and the discharging pipe 4 is communicated with the molten salt storage tank 1 through the return opening 7, so as to realize the flow of the high-temperature molten salt. And in order to guarantee that the fused salt can flow back smoothly, prevent the pipeline jam, in this embodiment, material loading pipe 3 and unloading pipe 4 are the standpipe or have the return bend of certain inclination.
In this embodiment, the molten salt pump 2 is a molten salt pump 2 in the prior art.
Second, cooling mechanism
The cooling mechanism directly uses high-temperature molten salt as a heat medium and air as a cold medium, and the heat exchange working condition of the molten salt can be obtained by analyzing the pressure, the temperature and the flow of the air. The cooling mechanism comprises a heat exchanger 10, air ducts 12 arranged on two sides of the working surface of the heat exchanger 10 and an air pump 13 communicated with the air ducts 12. In the embodiment, the cooling mechanism and the high-temperature molten salt circulating loop adopt an up-and-down compact structure in consideration of the laboratory area problem. Specifically, as shown in fig. 2, the heat exchanger 10 is installed above the molten salt storage tank 1 by using a heat exchanger support 11, and the heat exchanger 10 is communicated with the molten salt storage tank 1 through the feeding pipe 3 and the discharging pipe 4, so as to achieve the purpose of heat exchange between the high-temperature molten salt and air. In this embodiment, the heat exchanger 10 is a fin heat exchanger.
Two sides of the working surface of the heat exchanger 10 are fixedly provided with an air duct 12, and the end part of one air duct 12 is also communicated with an air pump 13. The air duct 12 and the air pump 13 in this embodiment are both horizontally arranged, so that the air generated by the air pump 13 can be smoothly sent to the heat exchanger 10, and the interference of the outside air to the experiment is reduced.
It should be further explained that, in this embodiment, the bolt through holes on the heat exchanger bracket 11 correspond to the bolt through holes on the heat exchanger 10 one by one, so as to ensure that the heat exchanger 10 is stably supported, and at the same time, the installation of the air duct 12 on the heat exchanger 10 is not affected.
Third, detection mechanism
The detection mechanism is used for detecting the pressure and the flow of the air in the air duct 12 and the air temperature on two sides of the working surface of the heat exchanger 10 in the experiment process. In this embodiment, the detection mechanism is disposed in the air duct 12 of the cooling mechanism, and specifically includes a temperature sensor, a pressure sensor, and a flow sensor, which are respectively connected to the computer. The temperature sensors are arranged on two sides of the working surface of the heat exchanger 10 and used for detecting the temperature of air before and after heat exchange; the pressure sensor is arranged in the middle of the air duct 12 and used for detecting the pressure generated when air flows; the flow sensors are disposed at the air inlet and the air outlet of the air duct 12, and are configured to detect the air flow at the air inlet and the air outlet of the air duct 12.
More specifically, in this embodiment, each temperature sensor is fixedly arranged on one side of the working surface of the heat exchanger 10 through a cross slide rail, and the cross slide rail is arranged in parallel with the working surface of the heat exchanger 10, so that in an experiment, the measuring point of the temperature sensor can be changed by controlling the cross slide rail through a computer according to actual needs. In this embodiment, each of the four inner side walls of each air duct 12 is provided with a pressure sensor, and each pressure sensor is fixedly disposed at the middle position of the air duct 12 through an electric slide rail, wherein the electric slide rail is disposed along the length direction of the air duct 12, so that in an experiment, the measuring point of any one pressure sensor can be changed by controlling the electric slide rail through a computer according to actual needs.
The working process of this embodiment is as follows:
firstly, opening a heating rod 5 at the bottom of a molten salt storage tank 1, and heating the molten salt in the molten salt storage tank 1 to be completely melted; then, the molten salt pump 2 is started to enable the molten salt to flow into the heat exchanger 10 from the feeding pipe 3; after the temperature of the molten salt in the heat exchanger 10 tends to be stable, selecting air flow parameters through a computer, controlling an air pump 13 to supply air to the heat exchanger 10, and exchanging heat with the molten salt in the heat exchanger 10 by utilizing the air; in the process, the temperature sensors, the flow sensors and the pressure sensors are utilized to detect the air temperature at two sides of the working surface of the heat exchanger 10 and the flow and the pressure of the air in the air duct 12 in real time; after the heat exchange tends to be stable, the temperature sensor, the flow sensor and the pressure sensor output real-time signals and feed back to the computer, and the computer intelligently records and stores the temperature, flow and pressure signals.
When the measuring point of the temperature sensor needs to be changed, the cross slide rail is controlled by the computer to correspondingly move; when the measuring point of the pressure sensor needs to be changed, the electric slide rail is controlled by the computer to correspondingly move.
Although the present invention has been described in detail with reference to the above embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described above, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. The utility model provides a fused salt air heat transfer performance testing arrangement which characterized in that: the device comprises a high-temperature molten salt circulation loop, a cooling mechanism arranged on the high-temperature molten salt circulation loop and a detection mechanism arranged in the cooling mechanism;
the high-temperature molten salt circulation loop comprises a molten salt storage tank, a feeding pipe and a discharging pipe, wherein the bottom end of the molten salt storage tank is provided with a heating rod, and the feeding pipe and the discharging pipe are used for communicating the molten salt storage tank with the cooling mechanism; wherein the feeding pipe is communicated with the molten salt storage tank through a molten salt pump;
the cooling mechanism comprises a heat exchanger fixedly arranged above the molten salt storage tank, air channels fixedly arranged on two sides of the working surface of the heat exchanger and an air pump communicated with the air channels; the heat exchanger forms a circulation loop with the molten salt storage tank through a feeding pipe and a discharging pipe; the detection mechanism is arranged in an air duct of the cooling mechanism.
2. The molten salt air heat exchange performance testing device of claim 1, characterized in that: the detection mechanism comprises temperature sensors arranged on two sides of the working surface of the heat exchanger, a pressure sensor arranged in the middle of the air duct and flow sensors arranged at the air inlet and the air outlet of the air duct; and the temperature sensor, the pressure sensor and the flow sensor are all in data connection with the computer.
3. The molten salt air heat exchange performance testing device of claim 2, characterized in that: every temperature sensor all sets firmly in one side of heat exchanger working face through the cross slide rail, cross slide rail and heat exchanger working face parallel arrangement.
4. The molten salt air heat exchange performance testing device of claim 2 or 3, characterized in that: the pressure sensor is fixedly arranged at the middle position of the air duct through the electric slide rail, and one pressure sensor is arranged on each of the four inner side walls of the air duct; the electric slide rail is arranged along the length direction of the air duct.
5. The molten salt air heat exchange performance testing device of claim 4, characterized in that: the heat exchanger is a finned heat exchanger fixedly arranged above the molten salt storage tank through a heat exchanger support, and two ends of the working surface of the finned heat exchanger are uniformly provided with an air duct.
6. The molten salt air heat exchange performance testing device of claim 5, characterized in that: the bolt through holes for installing the fin type heat exchanger on the heat exchanger support correspond to the bolt through holes for installing the air channels on the fin type heat exchanger one by one.
7. The molten salt air heat exchange performance test device of any one of claims 1-3 and 5-6, characterized in that: in the high-temperature molten salt circulation loop, the feeding pipe and the discharging pipe are both vertical pipes or bent pipes with slopes.
8. The molten salt air heat exchange performance testing device of claim 7, characterized in that: the fused salt storage tank is square three-dimensional storage tank to fused salt storage tank bottom is run through and is equipped with at least one heating rod.
9. The molten salt air heat exchange performance testing device of claim 8, characterized in that: the upper end of the fused salt storage tank is provided with a standby port for measuring temperature and liquid level.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202110034045.0A CN112666215A (en) | 2021-01-12 | 2021-01-12 | Fused salt air heat exchange performance testing device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110034045.0A CN112666215A (en) | 2021-01-12 | 2021-01-12 | Fused salt air heat exchange performance testing device |
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| CN112666215A true CN112666215A (en) | 2021-04-16 |
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| CN202110034045.0A Pending CN112666215A (en) | 2021-01-12 | 2021-01-12 | Fused salt air heat exchange performance testing device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113063174A (en) * | 2021-05-19 | 2021-07-02 | 西安热工研究院有限公司 | Efficient electric heating molten salt system and method |
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Application publication date: 20210416 |